diff --git a/pages/preferences.php b/pages/preferences.php
index 8cf165b47..c251fac7b 100644
--- a/pages/preferences.php
+++ b/pages/preferences.php
@@ -72,6 +72,7 @@ function DisplayPreferences($oP)
 	$oUICancelButton = ButtonUIBlockFactory::MakeForCancel();
 	$oUIToolbar->AddSubBlock($oUICancelButton);
 	$oUICancelButton->SetOnClickJsCode("window.location.href = '$sURL'");
+
 	// - Submit button
 	$oUISubmitButton = ButtonUIBlockFactory::MakeForPrimaryAction(Dict::S('UI:Button:Apply'), 'operation', 'apply_user_interface', true);
 	$oUIToolbar->AddSubBlock($oUISubmitButton);
diff --git a/sources/Core/MetaModel/HierarchicalKey.php b/sources/Core/MetaModel/HierarchicalKey.php
index 32f823b51..9131a5678 100644
--- a/sources/Core/MetaModel/HierarchicalKey.php
+++ b/sources/Core/MetaModel/HierarchicalKey.php
@@ -10,6 +10,13 @@ use CMDBSource;
 use CoreException;
 use MetaModel;
 
+/**
+ * Helper class to check and rebuild data integrity of hierarchical keys
+ *
+ * @author Eric Espie <eric.espie@combodo.com>
+ * @package Combodo\iTop\Core\MetaModel
+ * @since 3.0.0 N°2527
+ */
 class HierarchicalKey {
 
 	/**